PRESENT SITUATION OF INTERSPECIFIC RELATIONSHIP AMONG FISHES IN THE MAIN AREA OF TAIHU LAKE

The composit ion of fish communi ties showed that the migr ation fish species between river and lake was disappeared in the main area of Taihu Lake , except the stocked species .The main dominant species wer e lake anchovy (Coil ia ectenes), Icefishes and smaller Cypr inids .The coef ficient of associat ion be tween 8 dominant species showed that lake anchovy , Icefishes , Palaemon modestus , Toxabramis swinhonis , and Neosalanx ol igodont is have a similar temporal and spa tial dist ribut ions , and similar prey , but the y have diff erent reproduct ion per iod .Generally , loss or r eduction of a pr eda tor will lower the pr edation mor tali ty of its prey , causing an incr ease of prey densi ty and a concomitant incr ease in interspecific compet ition .